Abstract
Polymer electrolyte membrane water electrolysis (PEMWE) is one of the most appealing options to produce hydrogen and oxygen from water. Understanding bubble growth and flow transport behavior is essential to improve the cell performance and reduce the cost of PEMWE devices, especially at high current densities. This work presents and discusses the modeling results obtained for PEMWE under different operating conditions. In this work, the Lattice Boltzmann Method (LBM) [1-3] of computational fluid dynamics (CFD) is used to investigate the characteristics of bubble growth and transport through the porous transport layer (PTL) used in PEMWE. Studies of the evolution, growth profile, size distribution, and velocity distribution of propagating bubbles are explored. The model geometries of PTLs used in this study were obtained via X-ray computed tomography (CT). Figure 1 shows the bubbles in the PTL after they have detached from the electrode surface. This approach is able to examine the bubble characteristic regarding cell operating condition changes within different PTL samples. These findings should be useful for improving the modeling of bubble transport and enhancing our understanding of processes in PEM water electrolysis.
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